Dear theseithakas, one thing that I can point out to you is that you do not really know him at this point. He doesn't even know himself--not the real him. If he is an alcoholic, he has been using alcohol to numb his feelings (good and bad) in order to cope with life--so his reality of the world around his has been distorted and blunted. Not until he has stabilized in his recovery so that he can meet life's challenges without alcohol will a more accurate picture of him emerge. He will not be the same then as h e is n ow. He will see the world and others (including you) in it in a new light.
Why not wait until the person--minus the alcohol emerge and then make your decisions accordingly?
I do think it would be good for you to arm yourself with knowledge about this disease that will always be something that he will have to deal with. Knowlege is power. Alcoholism is definitely a disease that brings some stark realities with it. Wise not to bury your head in the sand on this one.
sincerely, dandylion